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use strict;
use warnings;
...
$MasterHash{$mvr} = map { split /:/; } @array1;

print Dumper \%MasterHash;

$Var1 = {
          'abc' => 'loaded before',
          'xyz' => 'loaded before',
          'v3'  => 16       #basically some number
        };

$Var1 = {
          'abc' => 'loaded before',
...
                     'k2' => 'v2'
                   } 
        };